ALS2 recovery of gold from keyboard membrane switches
Keyboard membrane switches are compact layered assemblies containing silver-filled conductive traces, metal contacts, flexible polymer films and small circuit boards. Their material value is often overlooked because keyboards are bulky, inexpensive to replace and widely treated as general electronic waste. Yet the silver traces and associated gold-plated contacts can provide a useful feed for specialist precious-metals recovery.
ALS2Project, supported by the European Union’s Horizon 2020 research and innovation programme, presents Ikoi S.p.A.’s acidless separation technology as a safer, cleaner alternative to conventional acid-based refining. Applied to carefully segregated keyboard material, ALS2 could help Australian recovery operators extract valuable metals closer to collection centres rather than shipping mixed components to large or distant facilities.
Why keyboard membrane switches contain recoverable metal
Most rubber-dome and membrane keyboards use conductive ink to print fine silver traces across polymer layers. Gold is more commonly found on plated contacts, connector fingers and circuit-board surfaces associated with the switch assembly. Shredding a whole keyboard therefore creates a mixed stream in which silver-rich traces and gold-bearing components are physically close together.
This distinction matters when planning a recovery process. A feedstock described as keyboard membrane switch silver traces may contain both silver and smaller quantities of gold. The objective is to recover the gold-bearing fraction without allowing copper, tin, steel, adhesives and plastics to obscure its value. Precious-metal refiners need a reasonably concentrated and identifiable input before they can apply their own finishing processes.
For Australian recyclers, the attraction is the waste hierarchy. Equipment collection and controlled dismantling keep usable keyboards available for refurbishment, while damaged or obsolete units can enter a dedicated metal-recovery stream. This approach treats obsolete electronics as a source of secondary material rather than as waste destined for landfill or low-value processing.
Positioning ALS2 within a keyboard recovery process
Ikoi’s ALS2 technology is designed around acidless separation, removing the need for mineral-acid refining within the core separation stage. This makes it potentially suitable for compact precious-metals recovery plants that operate near municipal e-waste facilities, corporate collection points or specialist dismantling sites. The technology’s broader applications include electronic waste and waste electrical and electronic equipment, known as WEEE.
A practical keyboard flowsheet begins with collection, manual dismantling and removal of plastic housings, cables, batteries and non-conductive parts. Membrane switches and their associated circuit boards can then be separated from keys, foam layers and other bulk material. Further size reduction may be needed before a metal-recovery step can produce a consistent feed.
ALS2’s role is to separate and recover the precious-metal-bearing material from that prepared feed. Gold-bearing fractions can then be transferred to an accredited refiner for sampling, fine treatment and market delivery. The public project positioning does not replace the need for detailed feed characterisation, so assays should establish the gold and silver content of each keyboard batch before equipment or commercial targets are selected.
Safety, footprint and sustainability considerations
Acidless separation can reduce the risks associated with storing, dosing and managing corrosive acids. That is particularly valuable for small recovery facilities where workers may have limited chemical-handling infrastructure and where strict controls apply to spills, ventilation and occupational exposure. It also supports a cleaner working environment for operators handling dismantled electronic equipment.
Compactness is another central benefit of the ALS2 approach. A smaller separation footprint could allow precious-metals recovery to be integrated with existing e-waste plants in Melbourne, Brisbane, Sydney or other metropolitan waste hubs. Shorter transport distances would improve logistics, although the equipment still needs to be designed around safe reception, controlled access and appropriate fire and environmental controls.
Acidless does not automatically mean impact-free or waste-free. Process residues, liquids, polymers and contaminated absorbents still require testing and lawful management. A credible sustainability assessment should compare water use, energy demand, chemical consumption, recovered-metal yield and final residue treatment against the chosen benchmark. Horizon 2020 support provides valuable research backing, while local pilot data remains necessary to confirm performance under Australian conditions.
Australian waste streams, markets and regulation
Australia offers a promising setting for this technology because dense commercial precincts, schools and universities in cities such as Melbourne, Brisbane and Sydney generate concentrated batches of obsolete peripherals. Workplace technology refreshes and institutional computer upgrades regularly release keyboards, mice and related components. These predictable streams can support a specialist recovery partnership more effectively than isolated household waste.
Disposal habits also influence the supply. Some residents take obsolete electronics to council e-waste events or specialist collection points, while others place them in general waste. Online marketplaces and local repair businesses extend the life of many keyboards, creating a circular economy in which resale and refurbishment reduce the volume requiring material recovery. Any Australian pilot must therefore work with established collection and refurbishment networks rather than assume that every discarded keyboard is available.
Regulation is fragmented across states and territories, with no single national e-waste law covering every device and recovery activity. The National Waste Policy provides national direction, while state and territory rules, licences and environment laws determine how waste and waste-derived materials must be handled. Gold’s inclusion on Australia’s Critical Minerals List adds strategic relevance, but does not exempt recovered material from refining standards or waste controls. Traceability, responsible transfer documentation and acceptance by an accredited downstream refiner are essential for access to the local gold market.
A practical Australian pilot pathway
An Australian pilot should combine a keyboard specialist, an electronic-waste contractor, a downstream precious-metals refiner and ALS2Project’s technical team. This partnership can begin with a representative batch of membrane switches removed during a controlled dismantling trial. Separate collection of silver-rich traces, gold-plated contacts and mixed residues would establish whether targeted segregation improves feed consistency.
Before commissioning equipment, the partners should analyse the feed and confirm the mass balance for every output. Relevant measures include gold and silver assays, recovery percentages, residue composition, water and energy consumption, and the classification of any remaining waste. These results can then determine an appropriate commercial arrangement without relying on the headline value of gold alone.
The pilot should also test operational practicality. This includes throughput, operator training, maintenance requirements, containment of conductive dust and integration with existing conveyor, sorting and storage systems. A facility near a metropolitan e-waste hub could reduce transport and demonstrate the compact-plant model. Repeating the assessment over several batches would provide stronger evidence than a single laboratory run.
Comparing separation routes
Acid-based refining and acidless separation offer different operational and commercial profiles. The appropriate choice depends on feed composition, available infrastructure, regulatory requirements and the value of the recovered fractions. ALS2 is intended to provide an alternative separation route, not a complete substitute for assaying, downstream refining or responsible waste management.
| Consideration | Acid-based refining | ALS2 separation |
|---|---|---|
| Core chemistry | Uses acid-based leaching or refining stages for many established processes | Designed to avoid mineral-acid refining in the core separation stage |
| Hazard profile | Requires controls for corrosive reagents, splashes, fumes and incompatible materials | Reduces acid-specific handling risks at the separation stage |
| Plant footprint | Often planned around larger chemical-processing infrastructure | Suitable for compact precious-metals recovery plants |
| Feedstock fit | Proven across many high-grade concentrates and varied chemical systems | Intended for carefully characterised precious-metal-bearing waste streams |
| Residues | May produce acid-bearing solutions, sludge or other treatment requirements | Still requires testing and management of process residues |
| Commercial maturity | Established refining and settlement networks | Emerging project-backed technology requiring local pilot validation |
| Best application | High-grade concentrates with suitable chemical handling facilities | Distributed urban-mining streams where logistics and safety are priorities |
Build a traceable source of recovered gold
Partnering with ALS2Project gives Australian businesses a structured route for evaluating keyboard-derived precious metals. The immediate action is to secure a representative membrane-switch feed, confirm its gold and silver content, and select an accredited Australian refiner for the recovered fractions. Safety, residue and recovery targets can then be tested within an existing e-waste operation.
A measured pilot can turn a dispersed waste stream into a traceable secondary resource for Australia’s gold supply chain. With controlled dismantling, acidless separation and accountable downstream refining, obsolete keyboard components can move from low-value disposal towards verified circular recovery.